Lunation
UNITS OF TIME BASED ON THE MOON
Synodic month; Draconic month; Anomalistic month; Sidereal month; Lunar Month; Lunation; Synodic Month; Tropical month; Moon month; Lunar months; Astronomical month
·noun The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 29/ to 29/ days, the average length being 29d., 12h., 44m., 2.9s.